More young Americans are saying they will vote in the upcoming midterm elections than in the last two midterms, according to a new national poll released Tuesday by the Harvard Kennedy School's Institute of Politics.

Thirty-seven percent of Americans under 30 say they definitely plan to vote in November, a significant jump from the 23 percent who said the same in 2014 and 31 percent in 2010.

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The survey, which included more than 2,500 responses from 18- to 29-year-olds, found that young Democrats are driving the surge in enthusiasm. Fifty-one percent say they will definitely vote this fall compared to just 36 percent of Republicans.

This is a significant reversal from the last election cycle in 2014, where young Republicans were more excited about the midterm elections. Nearly 70 percent say they want Democrats to take back control of Congress in 2018.

When it comes to the current administration, young voters overwhelmingly disapprove of President Donald Trump's job performance, a factor that's likely influencing the shift in enthusiasm. They also continue to express distrust in major institutions: Just 17 percent say they trust Congress all or most of the time, while 16 percent say the same about the media. The Supreme Court fared better at 43 percent.

With Facebook CEO Mark Zuckerberg testifying Tuesday before Congress, young Americans aren't feeling much better about the role of tech giants and social media. Only 27 percent say they trust Facebook to do the right thing all or most of the time, and about the same percentage said the same about Twitter.

The poll was conducted online March 8-25 among 2,631 18- to 29-year-old adults. The margin of sampling error for the full survey is plus or minus 2.5 percentage points.